Planetary Science Institute
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The Planetary Science Institute is a private nonprofit 501(c)(3) corporation dedicated to studying the origin, characteristics & evolution of Earth, our Solar System, & planetary systems around other stars. The Planetary Science Institute is a private, nonprofit 501(c)(3) corporation dedicated to solar system exploration. PSI scientists are involved in numerous NASA and international missions, the
07/24/2026
This week's is Freyja, a precious 9 1/2-week-old puppy when these photos were taken. Freyja is a new addition to the household of PSI Senior Scientist Catherine Johnson. Catherine describes Freyja as a “shark tooth fluffy.” Little piranha, indeed!
07/23/2026
We invite elementary and middle school teachers and informal educators to join PSI research scientists and education specialists for an engaging 4-hour workshop to learn more about how scientists classify and study objects in the Solar System! Registration link https://buff.ly/K6y01Bb
07/21/2026
PSI in the News: Senior Scientist David Grinspoon talks Viking 1's 50th anniversary and future human exploration of Mars with AZPM
Planetary scientists mark Mars exploration milestone NASA achieved the first successful soft-landing on the Red Planet 50 years ago July 20.
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1700 East Fort Lowell, Suite 106
Tucson, AZ
85719